Process of making barium oxid.



c. ROLLIN. PROGESS OF MAKING BARIUM OXID.

APPLICATION FILED JUNE 3, 1909'.

Patented Nov. 8, 1910.

for other purposes.

F CE.

CHARLES ROLLIN, 0F NEWCASTLE-UPON-TYN E, ENGLAND, ASSIGNOR T0 HIMSELF ANI) HEDWORTH BARIUM COMPANY LIMITED, QF'NEWGASTLE-UPON-TYNE, ENG-LAND.

PROCESS OF .MAKING BARIUM OXID.,

To all whom it may concern:

.ROLLIrI, Klng. of

Improvements in the Manufacture of Barium Compounds, of which the following is a specification.

This invention has for object the manufacture in a more advantageous manner than heretofore, of barium oxid suitable for use in the manufacture of barium peroxid for For this purpose, pure or practically pure amorphous anhydrous barium hydroxid, in a finely powdered condition is heated to a high temperature with a barium compound, such as barium peroxid or barium nitrate, capable of evolving gas when heated and of leaving a residue consisting substantially of barium oxid. Amorphous anhydrous barium hydroxid, suitable forthe purpose mentioned can be produced according to the invention described in the specification of another application for Letters Patent, Serial N 0. 545387, filed by me as a division of the present application. Accordin vention crystallized barium hy roxid is converted into a soft white porous mass of an hydrous amorphous barium hydroxid by slowly and uniformly heating the crystallized hydroxid in a partial vacuum at a comparatively low temperature, conveniently be- 7 low two hundred degrees centigrade as more particularly set forth in my said other specification.

In the accompanying drawings, Figure 1 shows in transverse section, apparatus suit.- able for the manufacture from crystallized barium hydroxid of anhydrous amorphous barium hydroxid according to my said other invention. Fig. 2 shows in cross section, apparatus suitable for the manufacture of porous barium oxid according to my pres--- ent invention.

For producing anhydrous barium hyflue 6 below and having an outlet 6 leading to' an exhauster 0 for producing a partial vacuum in the retort, the crystallized barium hydroxid (1 tb be converted into anhydrous Application filed June 3, 1909. Serial No. 499,922.

atv Newto that in Specification of Letters Patent. Patented N 8 1910,

barium hydrate being placed on the bottom of the retort and melted by the heat of hot gases passing through the flue e.

In carrying out the present invention, the amorphous anhydrous barium hydroxid may be intimately mixed with practically pure barium peroxid and the mixture charged into'a muffle furnace f' (Fig. 2) the floor f ered with barium oxid as indicated at 9, so that when the hydroxid melts, there shall be no foreign impurity present for it to dissolve or to aifect its purity. Conveniently the mixture may be in. the proportion of say about two parts by weight of barium peroxid rium hydroxid, but it is to be understood that these proportions are given merely by Way of example. The-mixture is rapidly heated in the mufile to a high temperature, say to fromabout 600 C. to 1000' C. (six hundred to one thousand degrees centigrade) so that'the amorphous barium hydroxid is caused to melt mass with the barium peroxid which is not melted but decomposes by the heat with evolution of oxygen which keeps the mass .in a porous condition and facilitates the decomposition of the anhydrous barium hydrate, which, is converted into barium oxid, which is also the product left by the decomposition of the peroxid. The barium oxid thus formed is very pure and porous and is specially suitable for conversion into barium peroxid by the methods ordinarily employed for the purpose.

Barium nitrate may be substituted for the barium peroxid in admixture with the anhydrous barium hydroxid, the gases escaping during its decomposition playing the same part as the oxygen from the peroxid in vmaking the resulting mass of barium oxid sufficiently porous for subsequent conversion into barium peroxid in a satisfactory manner. I find that carbon compounds of barium, or any mixtures which produce carbonates, or give olf any gaseous compound of carbon, are however disadvantageous to the successful carrying out of the invention. I am aware that it has heretofore been proposed to produce barium oxid by fusing together barium carbid and barium hydroxid, and by fusing together barium hyof which is preferably composed of or covto onepart by weight of the anhydrous ba-' losing its water of hydration,

and form a pasty ing gas when heated and heating such mixdroxid and barium nitrate with from Oto 1% of carbon, but such rocesses diflfer from that'hereinbefore descrlbed in that I spedrous barium hydroxid I employ diflers escially avoid the use of barium carbonate or any form of carbon thatcould form or give rise to carbonate while the amorphous anhyture. v p

3. A process for producing barium oxid, said process consistinginheatln amorphous anhydrous barium hydroxid with a barium compound capable of evolving an oxidizing gas when heated and of leaving a residue of barium oxid.

4. A process for producing barium oxid, said process consist ng in heating barium peroxid to a high temperature with amorphous anhydrous barium hydroxid.

' 5. A process for producing barium oxid y from barium hydroxid, said process consisting in mixing amorphous anhydrous barium hydroxid with a barium compound capable ofevolving an oxidizing gas when heated,

and heating the mixture to'a'temperature of I at least 600 C. p

6. A process for producing barium oxid from amorphous. anhydrous barium hydroxid, said process consisting in placing the barium h droxid'and a barlum compound ca able 0 evolving gas when heated, u on a be of a refractory barium compoun that willnot injuriously aflect the mass when heated, and heating the mass to a temperature of from 600 to 1000 C.

7. A process for producing barium oxid ,from amoigiphous anhydrous barium hy droxid, sai process consisting in heating barium peroxld'with the "amorphous anhydrous barium hydroxid to a high tempera ture upon a bed of barium oxid.

Signed at Newcastle-upon-Tyne this twenty-fourth day of May 1909. v

, CHARLES ROLLIN, Witnesses:

- C. W. S. Goononn, Amxn. WARDLAW. 

